<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #active {
            width: 300px;
            height: 260px;
            background-color: aquamarine;
        }
    </style>
</head>

<body>
    <!-- 选项卡 -->
    <div id="app">
        <button>按钮一</button>
        <button>按钮一</button>
        <button>按钮一</button>
        <button>按钮一</button>

        <div>
            <div id="active">内容一</div>
            <div>内容二</div>
            <div>内容三</div>
            <div>内容四</div>
        </div>
    </div>

    </div>
</body>
<script src="/vue.js"></script>
<script>
    const { createApp, ref } = Vue
    createApp({
        setup() {


        }
    }).mount("#app")
</script>

</html>